Truth is one of the maps available in the multiplayer beta of Halo 5: Guardians. It's a remake of Halo 2's Midship and we've got a video below showing just how different/ similar it is to the original.
The video below was captured at an event by YouTuber Ready Up Live. It's a full game of Slayer on Truth.
The available loadout is a combination of the Assault Rifle and the magnum, with some power weapon placements.